Drill-supporting column and column-clamp.



Nu. 653.307. w Patented luly I0, |900. W. K. NILLHULLAND.

lllllLLV SUPPORTING COLUMN AND COLUMN GLAMP.

A (Appummn md my `1s, 1899.)y

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wwwwwwwww www gw ff .9 wwwwwwwwwwwwwwwwwwiwwww tra WILLIAM K.MILLHOLLAND, OF CHICAGO, ILLINOIS, ,ASSIGNOR T-O'THE j GEORGE D.WHITCOMB COMPANY, OF ILLINOIS.

DRILL-SUPPORTING VConua/Ira AND coLuM-N-CLAMP.

SPECIFICATION forming part of Letter Application filed M ayilSylSQpQ.Serial No. 717,272. (No model.)

T0 all whom t may concern: V

Be. it known that I, WILLIAM K. MILLHOL- LAND, a citizen of the-UnitedStates, and a resident of Chicago, county of Cook, and State ofIllinois, have invented certain new and useful Improvements inDrill-Supporting Colu mns and Column-Clamps, of which the following is aspecication, and which are illustrated in the accompanying drawings,forming a part thereof.

This invention relates to that class of columns which are used in miningoperations and are adapted to be set between the floor and arch of amine-passage, each being provided with a jack-screw for adapting it tothe situation in which it is to be used.

The objects of the invention are to provide means for securely lookingthe column when adj usted to its place and to provide for clamping tosuch a column a drill-carrying frame, so that it may be convenientlyadjusted to any angular position and secured in any position to which itmay be adjusted. These objects are attained in the constructionhereinafterfully described and which is illustrated in the accompanyingdrawings, in which- Figure l is a side elevation of the column, partlyin section, the drill-frame being detached therefrom. 1 Fig. 2 is asimilar view from a point ninety degrees removed from the point of viewof Fig. 1, the drill-frame being shown as attached to the column. Fig. 3is a transverse section on the line 3 of Fig. 2, and Fig. 4 is atransverse section on the line 4 4 ofY Fig. 2.

The coluninA is of ordinary form and is provided Vwith a head a, adaptedto bear against the `arch of amine-passage. The footblock B` isconnected with column A by means of a threaded rod C entering a suitablesocket in the lower end of the column, to which rod it is secured by apin ca, The rod C is shown as extending entirely through the block B andresting and turning upon a foot-plate D, which is provided with anannular ratchet d,

fformed upon its upper face and encircling the block B. Gravity-pawls EE, preferably two in number, are pivoted to lugs Z1 l), projectinglaterallyfrom the side of the block B, thesepawls coperating'with theratchet d.

The pawls E bear against faces of the lugs veled edges thereof.

block B. The abrupt faces of the teeth of the ratchet d are radial as tothe ratchet, and the free ends of the pawls Eare correspondingly 'of thepassage. Lateral movement of the rod C on the plateD is prevented bytheengagement of its end with asuitable recess in the upper face of theplate. f" l The under face of the plate D is concave, as shown at d, sothat'asl pressure is applied by turning the screw C out of the colu mn'the earth upon which the plate rests will be crowded and compressedintoy this cavity, thereby sccurely anchoring the column against lateraldisplacement, andby reason of the increased friction due to thecompression of the material within the cavity of the plate the tendency4of the plate to rotate is checked. The peculiar form of the ratchet CZand the peculiar manner of mounting the pawls E also contribute toreduce the tendency of the screw-pressure to rotate the foot-plate, forthe reason that the back pressure of the lpawls is tangential. The pawlsbeing mounted in the tangential `manner shown are thrown entirely out ofengagement with the ratchet when turning backwardly. The frame forcarrying the drill is shown at F and is provided withv a circularattaching-foot` f, having its periphery beveled inwardly. 'The column-clamp comprises the members G g, which together encircle the column Aand are clamped thereto by the draw-bolts g passing through suitablelugs.

The member `G of the column-clamp is provided with a bracket 72., havinga circular bearing-face H,corresponding Vin size and form with the footf and having its periphery beveled inwardly. Toa laterally projectinglug K, formed upon the bracket 7l, there is pivotally secured, bymeansof the bolt ha pairf semin circular clamping members M m, whichtogether encircle the members fII and have their inner faces grooved toreceive `the bev- Between the pair of lugs o o, formed upon the free endof the member m,4 there is pivotally secured a draw-bolt P,

b b, which are tangential to the face of theV IOO which is adapted toenter between a similar pair of lugs Q Q, formed upon the free end ofthe member M, so that a nut p applied to the end of this drawebolt willbear against the rearward faces of these lugs to draw the members M mtogether, thereby securely clamping the membersfH, so that While thedrill-frame F may be adjusted to any desired angular position by firstturning back the nut Io p it may be rigidly secured in any position towhich it may be adjusted by turning up upon which the screw is adaptedto rest and turn, an annular ratchet formed on the upper face of theplate, a block fixed to the screw, and a pawl secured to the block andcoperating with the ratchet.

2. In a column for rock-drills and the like, in combination, a shaft, afoot-plate, a screw entering the shaft end, and resting in a recess inthe plate, an annular ratchet formed on the upper face of t-he plate, ablock fixed upon the screw and having a face tangential thereto, and apawl secured to the tangential face of the block and cooperating withthe ratchet.

3. In a column for rock-drills and the like, in combination, a shaft, afoot-block, a screw fixed in the block and entering the shaft end, aboss formed on the block and having a face tangential thereto, afoot-plate upon which the screw1 is adapted to rest and turn, an annularratchet formed on the upper face of the plate, the abrupt faces of theratchet-teeth being on planes radial as to the ratchet, and a pawlsecured to the tangential face of the boss and cooperating With theratchet.

4. In a column for rock-drills and the like, in combination, a shaft, afoot-block, a screw iixed in the block and entering the shaft end, afoot-plate upon which the screw is adapted to rest and turn, the lowerface of such plate being concave, an annular ratchet formed on the upperface of the plate, and a pawl secured to the block and cooperating Withthe ratchet.

WILLIAM K. MILIJIIOLLAND.

Witnesses:

C. O. MUDGE, W. C. WHITCOMB.

